Android布局视图围绕圆圈旋转和间隔?

时间:2013-01-05 15:00:12

标签: android layout graphics rotation

我正在试图找出一种围绕圆形布局一系列视图的方法,使每个视图旋转为面向圆的外部。下图是我正在寻找的草图。外部块是布局/视图组,红色方块表示我想要旋转的视图。

Rough Sketch of what I want to do

我熟悉PivotX,PivotY和旋转视图属性,并怀疑我会以某种方式使用它们,但我不确定如何使用这些以适当的布局来获得所需的效果。

2 个答案:

答案 0 :(得分:25)

这是一个执行此操作的示例。我创建了一个新的Android项目,并用RelativeLayout替换了已存在的FrameLayout。这是> = API 11只是因为View中的翻译和轮播调用:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="@string/hello_world" />
</FrameLayout>

我将在代码中创建一些快速视图,只需用您拥有的任何视图替换它们。我将它们全部放在布局的中心,将LayoutParams的重力设置为Gravity.CENTER。然后,我正在翻译并将它们旋转到正确的位置:

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    final FrameLayout main = (FrameLayout)findViewById(R.id.main);

    int numViews = 8;
    for(int i = 0; i < numViews; i++)
    {
        // Create some quick TextViews that can be placed.
        TextView v = new TextView(this);
        // Set a text and center it in each view.
        v.setText("View " + i);
        v.setGravity(Gravity.CENTER);
        v.setBackgroundColor(0xffff0000);
        // Force the views to a nice size (150x100 px) that fits my display.
        // This should of course be done in a display size independent way.
        FrameLayout.LayoutParams lp = new FrameLayout.LayoutParams(150, 100);
        // Place all views in the center of the layout. We'll transform them
        // away from there in the code below.
        lp.gravity = Gravity.CENTER;
        // Set layout params on view.
        v.setLayoutParams(lp);

        // Calculate the angle of the current view. Adjust by 90 degrees to
        // get View 0 at the top. We need the angle in degrees and radians.
        float angleDeg = i * 360.0f / numViews - 90.0f;
        float angleRad = (float)(angleDeg * Math.PI / 180.0f);
        // Calculate the position of the view, offset from center (300 px from
        // center). Again, this should be done in a display size independent way.
        v.setTranslationX(300 * (float)Math.cos(angleRad));
        v.setTranslationY(300 * (float)Math.sin(angleRad));
        // Set the rotation of the view.
        v.setRotation(angleDeg + 90.0f);
        main.addView(v);
    }
}

这就是结果:

Image of 8 views in a circle

答案 1 :(得分:1)

@Daniel的答案很棒。

如果您需要更多功能,可以在GitHub上使用名为 Android-CircleMenu

的漂亮库

enter image description here